Austin Powers in Goldmember(2002) [Britney Spears]: Head explodes when Mike Myers works his mojo on her, after she reveals herself as a fembot and attempts to shoot him with her breasts. (Thanks to Noel, Alessio, and Tom)

"Everytime"(2003) (music video): Drowned in the bathtub when she passes out due to a head injury from an earlier struggle with paparazzi; she dies in the emergency room shortly afterwards (and is implied to be reincarnated as a newborn baby in the same hospital). (This video has been interpreted as depicting her committing suicide, but this website explains the accidental-death interpretation, with a note that Britney herself has confirmed this explanation.) (This video is available on the DVD Britney Spears' Greatest Hits: My Prerogative.) (Thanks to Alessio, JF, and Rich)